Re: [SH][PATCH] Disable ABI frame sniffer

[Andrew STUBBS <andrew.stubbs@st.com>]

Hi Daniel,

Daniel Jacobowitz wrote:
> There are assembly routines in newlib too, you know.  I didn't say
> anything about glibc.  You may encounter linker generated branch
> trampolines in some cases, too.

I know you didn't say anything about glibc. I was just citing that as an 
example of a complex library.

Newlib does have assembly routines, but very few, on SH anyway. The only 
ones I know of off hand are memset and friends. There's the crt stuff, 
of course, but you have to go 'pastmain' to find that.

> In case you missed my sarcasm here, I was responding to "dependent on
> the values in registers and memory".  Of course it is!

I didn't miss it as such, but seriously, most of what GDB does doesn't 
involve following (possibly phantom) trails of pointers through target 
memory. This about the least certain data that GDB presents, simply 
because the uncertainties mount up.

> See Mark's reply for more on this.  Had you said what your problem
> really was, we could have saved a couple of back-and-forth exchanges;
> I'm extremely familiar with the problem of finding clean ways to
> terminate the backtrace.

OK, I'm listening. If we can get it so that both the 0xdeadbeef frames 
(one which comes from the dwarf unwinder - see my posting yesterday) are 
ignored then that would be a bonus.

>>BTW, were you (and others) waiting for them to do something about the SH 
>>specific patches I have been sending? I ask because I have had no 
>>response on a few.
> 
> 
> I review patches as fast as I am able.  I am more likely to review
> patches to code I know something about, which does not include the SH
> backend.
> 

I can understand that. I'm sure you have your own real work to be 
getting on with too. However, I have a selection of SH specific patches, 
submitted and queued, so this situation worries me a little. About half 
of sh-tdep.c is a total mystery to me - mostly the bits that have never 
caused me any trouble. My patches to that area are all quite simple, so 
it probably won't be too bad.

Thanks for all your time

Andrew Stubbs